/* JAI-Ext - OpenSource Java Advanced Image Extensions Library
 *    http://www.geo-solutions.it/
 *    Copyright 2018 GeoSolutions
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 *  Copyright (c) 2009-2011, Michael Bedward. All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 *  - Redistributions in binary form must reproduce the above copyright notice, this
 *    list of conditions and the following disclaimer in the documentation and/or
 *    other materials provided with the distribution.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.imagen.media.jiffle.runtime;

import org.junit.Test;

/**
 * Unit tests for the source image pixel specifiers.
 *
 * <p>Source image position can be specified as:
 *
 * <pre>
 *     imageName[ b ][ xref, yref ]
 *
 * where:
 *     b is an expression for band number;
 *
 *     xref and yref are either expressions for absolute X and Y
 *     ordinates (if prefixed by '$' symbol) or offsets relative
 *     to current evaluation pixel (no prefix).
 * </pre>
 *
 * The unit tests here work with a single band image
 *
 * @author Michael Bedward
 * @since 0.1
 * @version $Id$
 */
public class SingleBandImagePosTest extends RuntimeTestBase {

    @Test
    public void relativeReferences() throws Exception {
        System.out.println("   relative pixel position");

        String src = "dest = con(x() > 0, src[-1, 0], NULL);";

        testScript(src, new Evaluator() {
            double lastVal;

            public double eval(double val) {
                double outVal;
                if (x > 0) {
                    outVal = lastVal;
                } else {
                    outVal = Double.NaN;
                }

                lastVal = val;
                move();
                return outVal;
            }
        });
    }

    @Test
    public void absoluteReferences() throws Exception {
        System.out.println("   absolute pixel position");

        String src = "dest = con(x() > 5 && y() > 5, src[$5, $5], NULL);";

        testScript(src, new Evaluator() {
            double val55;

            public double eval(double val) {
                if (x == 5 && y == 5) {
                    val55 = val;
                }

                double outVal = Double.NaN;
                if (x > 5 && y > 5) {
                    outVal = val55;
                }

                move();
                return outVal;
            }
        });
    }
}
